Intimidating as that mug is, I wouldn’t worry much about giving it a poke. Stepping on one is what’ll far more likely make you rather dead. Venomous dorsal spines with a really potent neurotoxin. Anyone want to guess which Southern hemisphere, kangaroo-ridden, full of critters that’ll kill you country/continent has lots of ‘em?

“I got spiked on the finger by a Stonefish in Australia … never mind a bee sting. … Imagine having each knuckle, then the wrist, elbow and shoulder being hit in turn with a sledgehammer over the course of about an hour. Then about an hour later imagine taking a real kicking to both kidneys for about 45 minutes so that you couldn’t stand or straighten up. I was late 20s, pretty fit physically and this was the tiniest of nicks. Got sensation back in my finger after a few days but had recurrent kidney pains periodically for several years afterwards.” -Stonefish victim [6]

I don’t recommend poking it with a finger unless you are really sure which way Stoneyface is facing.
And on the southern edge of this place we have much more benign creatures to kill us, such as the blue ringed octopus. And jetskis.